CN1026812C - Construction for hanging freely auxiliary gushing tube in deep well - Google Patents
Construction for hanging freely auxiliary gushing tube in deep well Download PDFInfo
- Publication number
- CN1026812C CN1026812C CN91101722A CN91101722A CN1026812C CN 1026812 C CN1026812 C CN 1026812C CN 91101722 A CN91101722 A CN 91101722A CN 91101722 A CN91101722 A CN 91101722A CN 1026812 C CN1026812 C CN 1026812C
- Authority
- CN
- China
- Prior art keywords
- auxiliary jet
- sealant
- tube
- well
- stay cord
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
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Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B41/00—Equipment or details not covered by groups E21B15/00 - E21B40/00
- E21B41/02—Equipment or details not covered by groups E21B15/00 - E21B40/00 in situ inhibition of corrosion in boreholes or wells
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B17/00—Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Cables; Casings; Tubings
- E21B17/20—Flexible or articulated drilling pipes, e.g. flexible or articulated rods, pipes or cables
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B17/00—Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Cables; Casings; Tubings
- E21B17/20—Flexible or articulated drilling pipes, e.g. flexible or articulated rods, pipes or cables
- E21B17/206—Flexible or articulated drilling pipes, e.g. flexible or articulated rods, pipes or cables with conductors, e.g. electrical, optical
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L11/00—Hoses, i.e. flexible pipes
- F16L11/04—Hoses, i.e. flexible pipes made of rubber or flexible plastics
- F16L11/08—Hoses, i.e. flexible pipes made of rubber or flexible plastics with reinforcements embedded in the wall
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L11/00—Hoses, i.e. flexible pipes
- F16L11/04—Hoses, i.e. flexible pipes made of rubber or flexible plastics
- F16L11/12—Hoses, i.e. flexible pipes made of rubber or flexible plastics with arrangements for particular purposes, e.g. specially profiled, with protecting layer, heated, electrically conducting
Abstract
A new auxiliary injection tube concept is disclosed for injecting a fluid containing corrosion and/or deposit inhibiting agents into a well from the surface, without stopping working. The auxiliary injection tube includes a tube 10 conveying the injected agents. The tube is coated with a material 11 which is inert with respect to to the fluid collected by the well. Support cables 12, disposed about the tube 10 and also coated with material 11, provide both secondary protection of the tube 10 in the case of damage to coating 11 and the mechanical characteristics required for the injection tube, particularly during withdrawal from the well.
Description
The present invention relates to a kind of auxiliary jet device of the inhibitor of jet etching and/or precipitation to mine that need not to stop to exploit promptly serially from ground.
The present invention is specially adapted to geothermal well, to overcome the influence that heat chemistry is corroded and incrustation brings that geothermal heat flow produces, increases the service life.After the seventies, in the basin geothermal mining area, Paris that has numerous " twin-well " system, these problems arouse attention.
In these devices, temperature is that 50 °～85 ℃ and the geothermal heat flow that contains (15-25 grams per liter) more high in salt can form the gas phase attitude that is dissolved with more carbon dioxide and water, it is equivalent to the weak acid that pH value is 6-6.4, the harm of this erosion is: because of the influence of sediment in the burn into pipe and the obstruction of reservoir exposed part, the destruction of being caused is passed to some zone of container, constantly damages rapidly.
The process of damaging is roughly as follows:
Be corroded on the not half on the jet pipe of-injection apparatus in well;
-dissolved the iron pipe and the solution at place form iron sulfide;
Incrustation on the topping of-iron sulfide in the steel pipe pipe, and can't be to forming protection (because the corrosion below sediment is still enlarging) in managing;
Particle in the-water (solid of suspension) diffusion, and with the heat interchanger obstruction, the sediment/incrustation in the jet pipe accumulates in the pipe bottom and the inside of exposing;
-suck the loss amount increasing of liquid, the circulation of geothermal loop is reduced, ground installation and device are blocked.
, can to adopt various improvement and give anti-method so that overcome above-mentioned shortcoming fully in order reducing, wherein chemical method is used often.
Because the corrosion/sediment inhibitor that sprays to the shaft bottom contains corrosion thin layer and deposit seed respectively, so can not satisfying, above-mentioned processing method uses all necessary conditions in the underground heat facility, particularly to the requirement of the stability of auxiliary jet, explained a kind of fat that sprays in the French Patent (FRP) 2463197 and 2502239 and revolved amine as the processing method of inhibitor and the injection apparatus that links at shaft bottom and auxiliary jet.
The purpose of producing well is to gather underground heat as much as possible, and therefore, the size of the auxiliary jet in the production casing should be minimum, with the loss of limited flow.The diameter that contacts with geothermal heat flow is that the carbon steel tube commonly used of 1 "～1 1/4 " is easy to be corroded, and is 1 with diameter " fiberglass pipe, then often have an accident because the mechanical property of materials is too poor.
Select non-ferrous alloy (chromium, molybdenum, nickel etc.) that cost is increased, and bring other defective, that is, because the existence of hydrogen sulfide becomes fragile solid structure on a small quantity.
The objective of the invention is to, for reducing the inconvenience of this system in actual use process, adopt its mechanical performance to meet a metal die of application requirements, and outside this pipe, apply and a kind ofly present the material of inertia, keep the diameter that limits simultaneously for geothermal heat flow.
As theme of the present invention a kind of from ground to well jet etching or sedimentary inhibitor and the device that do not interrupt its exploitation has the auxiliary jet (6) of a transport inhibitors, this auxiliary jet is gone up so that install on the ground and deposit around a drum (8) continuously, and can be fixedly mounted in aboveground, this auxiliary jet (6) fixedly finishing by a pulley (9) on the ground, auxiliary jet just is installed on this pulley.
The feature of this device is: auxiliary jet (6) has a central tubular mechanism (10); its outside is surrounded by for liquid in the well and presents the material (11) of inertia and be arranged on central tube (10) stay cord (12) on every side; this stay cord is coated with material (11); so that having, this device descends and the required mechanical strength of lifting operation; and second protection mechanism that under the situation that covering (11) damages, can be used as pipe (10), and covering (11) is used for protection tube (10) and is not subjected to the corrosion of the interior liquid of well.
By in conjunction with the described embodiment of following accompanying drawing, can be readily appreciated that every advantage of the present invention.Wherein:
Fig. 1 is the embodiment that employed auxiliary jet in the producing well of deep well pump is housed;
Fig. 2 is a cross-sectional view of realizing an auxiliary jet of purpose of the present invention;
Comprise a, b, c and d among Fig. 3, they are respectively the viewgraph of cross-section of realizing the multi-form auxiliary jet of the object of the invention.
In Fig. 1, geothermal heat flow is that the pressure in the pump 1 that is mounted in the carrier pipe 2 is seen off, and the pipeline below the control valve 3 of geothermal heat flow on well head 4 is delivered to ground pipeline 5 then, delivers in the heat interchanger again.Auxiliary jet 6 passes through well head 4 by the centre of stuffing box 7, and when well head moves (particularly in actual use), stuffing box 7 is used for guaranteeing the sealing of auxiliary jet on the well head 4.Auxiliary jet is wrapped on the drum 8 on ground, and it can make the lower extreme point of auxiliary jet reach very dark position.Pulley 9 is contained between drum 8 and the stuffing box 7, and it twines radius and its performance adapts, and it is responsible for supporting auxiliary jet, and it is remained on certain position.
Fig. 2 has represented to realize an embodiment of the object of the invention.A central tubular mechanism 10 that is used for carrying the sediment inhibitor and guarantees the mechanical performance of auxiliary jet necessity is wherein arranged.The skin of central tube 10 is surrounded by electrochemistry inert material 11, and it contacts with geothermal heat flow, and this anticorrosive coat is made on the quantity-produced machine, and central tube 10 and stay cord 12 are at the center of material 11.Anticorrosive coat can be made with extruding or blowing.In conventional application scenario, the material of cylindricality covering 11 is polyester materials, and it can bear mechanical performance and the heat and the chemical property of use.In some application scenario, also can adopt such as synthetic rubber, nylon or especially when temperature effect is arranged with polytetrafluoroethylene (PTFE) materials such as (teflons).The optimal selection of covering 11 materials depends on various specific applied environment conditions, as underground heat or oil exploitation and temperature etc.In covering 11 the insides and pipe 10 outside some steel stay cords 12 are arranged, when central tube damages or during covering 11 wearing and tearing, in well constantly in the lifting process, steel stay cord 12 can play the effect of protection central tube 10 as measurement mechanism; Steel stay cord 12 also can make auxiliary jet have corresponding mechanical performance, with guarantee install, in the lifting process, even the safety when pipe 10 fractures.The clad material 11 that separates metal tube also can play the effect of coupling bar.
In most preferred embodiment, according to the oil exploitation standard, the diameter of auxiliary jet end is 1 " (25.4 millimeters); The central tube fixedly material of usefulness should be able to not be subjected to the influence of sediment composition, can be the INOX316L steel pipe, and its external diameter is 10 millimeters, and internal diameter is 8 millimeters.Other auxiliary jets that use in corrosive liquids can be used Incoloy82b, solid health nickel alloy 625, or the Hasteloy material, but are not only for these.The quantity of stay cord 12 (being preferably 4) can change with the difference of mode of occupation, and in Fig. 2, the external diameter of stay cord 12 is 5 millimeters, and this external diameter is decided according to the size of the standard of using and other parts.For example, in another embodiment, the external diameter of auxiliary jet can be 1 1/4, and " (31.75 millimeters), the external diameter of central tube 10 are 12 millimeters, and internal diameter is 10 millimeters.Obviously, the drawing coefficient of stay cord 12 materials is less than the drawing coefficient of pipe 10.This design can be used for fixed (promptly being placed on the fixed location), also can be used for injecting liquid into certain position.
Fig. 3 represents to realize other different modification of the auxiliary jet of the object of the invention.
Figure therein a) in, auxiliary jet 6 comprises a central tubular mechanism 10, the first cylindricality sealant 110 that is made of material 11 encases central tubular mechanism 10, the skin of tubulose mechanism has four stay cords 120 that are arranged in the sealant 110,121,122 and 123, they are symmetrical in the longitudinal axis of central tube 10.Four stay cords are preferably in two plane orthogonal relative in twos.
At Fig. 3 b) in, second sealant 111 is arranged between first sealant 110 and core jet pipe 10, second sealant of the certain material of selecting according to application requirements can be protected core jet pipe 10 well.
At Fig. 3 c) in, the 3rd sealant 112 that encases first sealant 110 is arranged, the 3rd sealant of outer layer sleeve type can be strengthened the sealing of whole member to external agency.Adopt Fig. 3 d at auxiliary jet) during pattern, flexible when keeping twining simultaneously for the mechanical strength of strengthening auxiliary jet wherein is provided with 8 stay cords 120～127, and these stay cords are symmetrically distributed along the middle longitudinal axis of central tube.
The corrosion-resistant sealant is not limited to above-mentioned first sealant, 110, the second sealants 111 and the 3rd sealant 112, and the material that constitutes sealant is,
At Fig. 3 b) in:
Second sealant, 111 first sealants 110
Fluoridize polyamide (PVDF) polyamide 11(PA11)
Polyamide 11(PA11) polymeric polymer propene (PP)
Fluoridize polyamide (PVDF) polymeric polymer propene (PP)
Chorotrifluoro Ethylene(Halar) polyamide 11(PA11)
Chorotrifluoro Ethylene(Halar) fluoridizes polyamide (PVDF)
At Fig. 3 c) in:
First sealant, 110 second sealants 111 the 3rd sealant 112
Polymeric polymer propene (PP) polyamide 11(PA11) EPDM/ polypropylene
Polymeric polymer propene (PP) is fluoridized polyamide (PVDF) EPDM/ polypropylene
Another preferably method be transmit to handle signal of telecommunication instruction from injector head to the shaft bottom with a pair of stay cord.
Claims (9)
1; a kind of from ground to well jet etching or sedimentary inhibitor and the device that do not interrupt its exploitation; auxiliary jet (6) comprising a transport inhibitors; this auxiliary jet is gone up so that install on the ground and deposit around a drum (8) continuously; and described auxiliary jet can be fixedly mounted in aboveground; this auxiliary jet (6) fixedly finishing on the ground by a pulley (9); auxiliary jet just is installed on this pulley; this device is characterised in that: auxiliary jet (6) comprises a central tubular mechanism (10); its outside is surrounded by for liquid in the well and presents the material (11) of inertia and be arranged on central tube (10) stay cord (12) on every side; this stay cord also is coated with material (11); so that having, this device descends and the necessary mechanical strength of lifting operation; and under the situation that covering (11) damages; this stay cord also can be as second protection mechanism of pipe (10), and covering (11) is used for protection tube (10) and is not subjected to the corrosion of liquid in the well.
2, device according to claim 1 is characterized in that, described auxiliary jet (6) is the coiling pipe of a whole movable-type, so that spray as required.
3, device according to claim 1 is characterized in that, inert material (11) is at vertical continuously extruded polymer.
4, device according to claim 1 is characterized in that, described stay cord (12) is a metallic cable.
5, device according to claim 1 is characterized in that, described central tube (10) selection can be born the stainless steel material of the condition of its use.
6, according to any one device in the claim 1 to 5, it is characterized in that auxiliary jet comprises:
-one central tubular mechanism (10) that wraps in metal on every side, first sealant (11) that constitutes by material (11).
-four stay cords (120,121,122,123) that are located at the first sealant center, the longitudinal axis symmetry of they and central tube, relative in twos in two plane orthogonal.
7, device according to claim 6 is characterized in that, between the central tubular mechanism (10) of metal and first sealant (110) second sealant is arranged.
8, device according to claim 7 is characterized in that, the 3rd sealant that first sealant is encased is arranged.
9, device according to claim 1 is characterized in that, 8 and the symmetrically arranged stay cord of central tube longitudinal axis (120 to 127) are arranged in auxiliary jet.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR9002207 | 1990-02-22 | ||
| FR9002207A FR2658559B1 (en) | 1990-02-22 | 1990-02-22 | DEVICE FOR INJECTING INTO A WELL OF CORROSION OR DEPOSITION INHIBITORS USING AN AUXILIARY INJECTION TUBE. |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1055219A CN1055219A (en) | 1991-10-09 |
| CN1026812C true CN1026812C (en) | 1994-11-30 |
Family
ID=9394030
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN91101722A Expired - Fee Related CN1026812C (en) | 1990-02-22 | 1991-02-21 | Construction for hanging freely auxiliary gushing tube in deep well |
Country Status (13)
| Country | Link |
|---|---|
| US (1) | US5236036A (en) |
| EP (1) | EP0469133B1 (en) |
| CN (1) | CN1026812C (en) |
| AT (1) | ATE99383T1 (en) |
| AU (1) | AU633708B2 (en) |
| CA (1) | CA2055495C (en) |
| DE (1) | DE69100884T2 (en) |
| DK (1) | DK0469133T3 (en) |
| DZ (1) | DZ1491A1 (en) |
| ES (1) | ES2048011T3 (en) |
| FR (1) | FR2658559B1 (en) |
| RU (1) | RU2066366C1 (en) |
| WO (1) | WO1991013235A1 (en) |
Families Citing this family (27)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0721053A1 (en) * | 1995-01-03 | 1996-07-10 | Shell Internationale Researchmaatschappij B.V. | Downhole electricity transmission system |
| US5638904A (en) * | 1995-07-25 | 1997-06-17 | Nowsco Well Service Ltd. | Safeguarded method and apparatus for fluid communiction using coiled tubing, with application to drill stem testing |
| US6860320B2 (en) * | 1995-09-12 | 2005-03-01 | Enlink Geoenergy Services, Inc. | Bottom member and heat loops |
| GB9621235D0 (en) * | 1996-10-11 | 1996-11-27 | Head Philip | Conduit in coiled tubing system |
| US6112813A (en) * | 1997-02-20 | 2000-09-05 | Head; Philip | Method of providing a conduit and continuous coiled tubing system |
| US5927405A (en) * | 1997-06-13 | 1999-07-27 | Abb Vetco Gray, Inc. | Casing annulus remediation system |
| US6289992B1 (en) | 1997-06-13 | 2001-09-18 | Abb Vetco Gray, Inc. | Variable pressure pump through nozzle |
| US6186239B1 (en) | 1998-05-13 | 2001-02-13 | Abb Vetco Gray Inc. | Casing annulus remediation system |
| US6712150B1 (en) | 1999-09-10 | 2004-03-30 | Bj Services Company | Partial coil-in-coil tubing |
| EP1466070A1 (en) | 2002-01-17 | 2004-10-13 | Presssol Ltd. | Two string drilling system |
| WO2003062590A1 (en) * | 2002-01-22 | 2003-07-31 | Presssol Ltd. | Two string drilling system using coil tubing |
| US6834722B2 (en) | 2002-05-01 | 2004-12-28 | Bj Services Company | Cyclic check valve for coiled tubing |
| US7090018B2 (en) | 2002-07-19 | 2006-08-15 | Presgsol Ltd. | Reverse circulation clean out system for low pressure gas wells |
| US7204327B2 (en) * | 2002-08-21 | 2007-04-17 | Presssol Ltd. | Reverse circulation directional and horizontal drilling using concentric drill string |
| US7343983B2 (en) * | 2004-02-11 | 2008-03-18 | Presssol Ltd. | Method and apparatus for isolating and testing zones during reverse circulation drilling |
| US20050178586A1 (en) * | 2004-02-12 | 2005-08-18 | Presssol Ltd. | Downhole blowout preventor |
| US20050252661A1 (en) * | 2004-05-13 | 2005-11-17 | Presssol Ltd. | Casing degasser tool |
| US7753112B1 (en) | 2006-11-10 | 2010-07-13 | Angel Petroleum Technologies LLC | Fluid production system and method |
| US7753111B1 (en) | 2007-11-02 | 2010-07-13 | Angel Petroleum Technologies LLC | Reinforced tubing string |
| RU2445449C1 (en) * | 2010-09-16 | 2012-03-20 | Ильдар Зафирович Денисламов | Method for removing deposits from bore-hole pump and flow column |
| BR112016023822B8 (en) * | 2014-05-16 | 2023-02-07 | Multi Chem Group Llc | CORROSION INHIBITION METHOD AND COMPOSITION |
| US20170051384A1 (en) * | 2015-08-12 | 2017-02-23 | Alcoa Inc. | Apparatus, manufacture, composition and method for producing long length tubing and uses thereof |
| US11022237B2 (en) * | 2017-02-27 | 2021-06-01 | Titeflex Commercial Inc. | Hose assemblies with reduced axial stress |
| US11525186B2 (en) | 2019-06-11 | 2022-12-13 | Ecolab Usa Inc. | Corrosion inhibitor formulation for geothermal reinjection well |
| CN111322034B (en) * | 2020-02-12 | 2022-03-08 | 大庆油田有限责任公司 | Recovery-free pipe cleaning body and pipe cleaning method |
| AU2021267371A1 (en) * | 2020-05-07 | 2022-12-08 | Baker Hughes Oilfield Operations Llc | Chemical injection system for completed wellbores |
| RU2753290C1 (en) * | 2021-02-10 | 2021-08-12 | Общество с ограниченной ответственностью «АСДМ-Инжиниринг» | Method and system for combating asphalt-resin-paraffin and/or gas hydrate deposits in oil and gas wells |
Family Cites Families (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3234723A (en) * | 1959-08-03 | 1966-02-15 | Kenard D Brown | Elongated tension load carrying element for oil wells and the like |
| US3526086A (en) * | 1968-04-12 | 1970-09-01 | North American Rockwell | Multiconduit underwater line |
| HU176430B (en) * | 1975-04-03 | 1981-02-28 | Taurus Gumiipari Vallalat | Process for producing incombustible - first of all hidraulic - liquide-consisting systhems of rubber,metal and/or textile |
| FR2417709A1 (en) * | 1978-02-21 | 1979-09-14 | Coflexip | FLEXIBLE COMPOSITE TUBE |
| US4336415A (en) * | 1980-05-16 | 1982-06-22 | Walling John B | Flexible production tubing |
| US4619323A (en) * | 1981-06-03 | 1986-10-28 | Exxon Production Research Co. | Method for conducting workover operations |
| US4470621A (en) * | 1982-01-04 | 1984-09-11 | Hydril Company | Flexible tubular connector |
| US4570705A (en) * | 1984-03-26 | 1986-02-18 | Walling John B | Sheave drive assembly for flexible production tubing |
| US5018583A (en) * | 1990-03-15 | 1991-05-28 | Conoco Inc. | Well process using a composite rod-stiffened pressurized cable |
-
1990
- 1990-02-22 FR FR9002207A patent/FR2658559B1/en not_active Expired - Lifetime
-
1991
- 1991-02-20 DZ DZ910028A patent/DZ1491A1/en active
- 1991-02-21 CN CN91101722A patent/CN1026812C/en not_active Expired - Fee Related
- 1991-02-22 RU SU915010169A patent/RU2066366C1/en not_active IP Right Cessation
- 1991-02-22 CA CA002055495A patent/CA2055495C/en not_active Expired - Fee Related
- 1991-02-22 EP EP91905090A patent/EP0469133B1/en not_active Expired - Lifetime
- 1991-02-22 AT AT91905090T patent/ATE99383T1/en active
- 1991-02-22 AU AU73437/91A patent/AU633708B2/en not_active Ceased
- 1991-02-22 DE DE69100884T patent/DE69100884T2/en not_active Expired - Fee Related
- 1991-02-22 ES ES91905090T patent/ES2048011T3/en not_active Expired - Lifetime
- 1991-02-22 US US07/773,656 patent/US5236036A/en not_active Expired - Fee Related
- 1991-02-22 WO PCT/FR1991/000149 patent/WO1991013235A1/en active IP Right Grant
- 1991-02-22 DK DK91905090.6T patent/DK0469133T3/en active
Also Published As
| Publication number | Publication date |
|---|---|
| ES2048011T3 (en) | 1994-03-01 |
| DE69100884T2 (en) | 1994-07-21 |
| CN1055219A (en) | 1991-10-09 |
| FR2658559A1 (en) | 1991-08-23 |
| US5236036A (en) | 1993-08-17 |
| ATE99383T1 (en) | 1994-01-15 |
| AU7343791A (en) | 1991-09-18 |
| EP0469133A1 (en) | 1992-02-05 |
| DZ1491A1 (en) | 2004-09-13 |
| WO1991013235A1 (en) | 1991-09-05 |
| DE69100884D1 (en) | 1994-02-10 |
| AU633708B2 (en) | 1993-02-04 |
| CA2055495C (en) | 2003-05-06 |
| CA2055495A1 (en) | 1991-08-23 |
| RU2066366C1 (en) | 1996-09-10 |
| EP0469133B1 (en) | 1993-12-29 |
| FR2658559B1 (en) | 1992-06-12 |
| DK0469133T3 (en) | 1994-04-25 |
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| C14 | Grant of patent or utility model | ||
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| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |